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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * Copyright (c) 2010-2011, NVIDIA Corporation</span>
<a name="l00003"></a>00003 <span class="comment"> * All rights reserved.</span>
<a name="l00004"></a>00004 <span class="comment"> *</span>
<a name="l00005"></a>00005 <span class="comment"> * Redistribution and use in source and binary forms, with or without</span>
<a name="l00006"></a>00006 <span class="comment"> * modification, are permitted provided that the following conditions are met:</span>
<a name="l00007"></a>00007 <span class="comment"> *   * Redistributions of source code must retain the above copyright</span>
<a name="l00008"></a>00008 <span class="comment"> *     notice, this list of conditions and the following disclaimer.</span>
<a name="l00009"></a>00009 <span class="comment"> *   * Redistributions in binary form must reproduce the above copyright</span>
<a name="l00010"></a>00010 <span class="comment"> *     notice, this list of conditions and the following disclaimer in the</span>
<a name="l00011"></a>00011 <span class="comment"> *     documentation and/or other materials provided with the distribution.</span>
<a name="l00012"></a>00012 <span class="comment"> *   * Neither the name of NVIDIA Corporation nor the</span>
<a name="l00013"></a>00013 <span class="comment"> *     names of its contributors may be used to endorse or promote products</span>
<a name="l00014"></a>00014 <span class="comment"> *     derived from this software without specific prior written permission.</span>
<a name="l00015"></a>00015 <span class="comment"> *</span>
<a name="l00016"></a>00016 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS &quot;AS IS&quot; AND</span>
<a name="l00017"></a>00017 <span class="comment"> * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED</span>
<a name="l00018"></a>00018 <span class="comment"> * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE</span>
<a name="l00019"></a>00019 <span class="comment"> * DISCLAIMED. IN NO EVENT SHALL &lt;COPYRIGHT HOLDER&gt; BE LIABLE FOR ANY</span>
<a name="l00020"></a>00020 <span class="comment"> * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES</span>
<a name="l00021"></a>00021 <span class="comment"> * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;</span>
<a name="l00022"></a>00022 <span class="comment"> * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND</span>
<a name="l00023"></a>00023 <span class="comment"> * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT</span>
<a name="l00024"></a>00024 <span class="comment"> * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS</span>
<a name="l00025"></a>00025 <span class="comment"> * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
<a name="l00026"></a>00026 <span class="comment"> */</span>
<a name="l00027"></a>00027 
<a name="l00028"></a>00028 <span class="preprocessor">#include &lt;<a class="code" href="vector_8h.html" title="Define linear-algebra vector classes.">nih/linalg/vector.h</a>&gt;</span>
<a name="l00029"></a>00029 
<a name="l00030"></a>00030 <span class="keyword">namespace </span>nih
<a name="l00031"></a>00031 {
<a name="l00032"></a>00032 
<a name="l00033"></a>00033 NIH_HOST_DEVICE FORCE_INLINE uint32 toRGBE(<span class="keyword">const</span> <span class="keywordtype">float</span> r, <span class="keyword">const</span> <span class="keywordtype">float</span> g, <span class="keyword">const</span> <span class="keywordtype">float</span> b)
<a name="l00034"></a>00034 {
<a name="l00035"></a>00035     <span class="keywordtype">float</span> v = 0;
<a name="l00036"></a>00036     <span class="keywordflow">if</span> (r &gt; v) v = r;
<a name="l00037"></a>00037     <span class="keywordflow">if</span> (g &gt; v) v = g;
<a name="l00038"></a>00038     <span class="keywordflow">if</span> (b &gt; v) v = b;
<a name="l00039"></a>00039 
<a name="l00040"></a>00040     <span class="keyword">union</span>
<a name="l00041"></a>00041     {
<a name="l00042"></a>00042         <span class="keywordtype">float</span>  f;
<a name="l00043"></a>00043         uint32 i;
<a name="l00044"></a>00044     } fi;
<a name="l00045"></a>00045 
<a name="l00046"></a>00046     fi.f = v;
<a name="l00047"></a>00047     <span class="keywordtype">int</span> exponent = ((fi.i &gt;&gt; 23u) &amp; 0xFF) - 126u;
<a name="l00048"></a>00048     <span class="keywordtype">int</span> rgbe = (exponent + 128u) &amp; 0xFF;
<a name="l00049"></a>00049     <span class="keywordflow">if</span> (rgbe &lt; 10) <span class="keywordflow">return</span> 0;
<a name="l00050"></a>00050     fi.i = ((((rgbe &amp; 0xFF) - (128u + 8u)) + 127u) &lt;&lt; 23u) &amp; 0x7F800000;
<a name="l00051"></a>00051 
<a name="l00052"></a>00052     <span class="keywordtype">float</span> f = 1.0f / fi.f;
<a name="l00053"></a>00053     rgbe |= ((uint32) (r * f) &lt;&lt; 24);
<a name="l00054"></a>00054     rgbe |= ((uint32) (g * f) &lt;&lt; 16);
<a name="l00055"></a>00055     rgbe |= ((uint32) (b * f) &lt;&lt; 8);
<a name="l00056"></a>00056     <span class="keywordflow">return</span> rgbe;
<a name="l00057"></a>00057 }
<a name="l00058"></a>00058 
<a name="l00059"></a>00059 NIH_HOST_DEVICE FORCE_INLINE Vector3f fromRGBE(<span class="keyword">const</span> uint32 rgbe)
<a name="l00060"></a>00060 {
<a name="l00061"></a>00061     <span class="keyword">union</span>
<a name="l00062"></a>00062     {
<a name="l00063"></a>00063         <span class="keywordtype">float</span>  f;
<a name="l00064"></a>00064         uint32 i;
<a name="l00065"></a>00065     } fi;
<a name="l00066"></a>00066 
<a name="l00067"></a>00067     <span class="comment">//fi.i = ((((rgbe &amp; 0xFF) - (128u + 8u)) + 127u) &lt;&lt; 23u) &amp; 0x7F800000;</span>
<a name="l00068"></a>00068     fi.i = (((rgbe &amp; 0xFF) - 9u) &lt;&lt; 23u) &amp; 0x7F800000;
<a name="l00069"></a>00069 
<a name="l00070"></a>00070     <span class="keyword">const</span> <span class="keywordtype">float</span> f = fi.f;
<a name="l00071"></a>00071     <span class="keywordflow">return</span> Vector3f(
<a name="l00072"></a>00072         f *  (rgbe &gt;&gt; 24),
<a name="l00073"></a>00073         f * ((rgbe &gt;&gt; 16) &amp; 0xFF),
<a name="l00074"></a>00074         f * ((rgbe &gt;&gt; 8)  &amp; 0xFF) );
<a name="l00075"></a>00075 }
<a name="l00076"></a>00076 
<a name="l00077"></a>00077 } <span class="comment">// namespace nih</span>
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